Schematic editor: fix not working tool to show/hide invisible pins.

Fixes #4222
https://gitlab.com/kicad/code/kicad/issues/4222

eeschema/netlist_object.h

@@ -93,7 +93,7 @@ class NETLIST_OBJECT
 {
 public:
     NETLIST_ITEM m_Type;                    /* Type of item (see NETLIST_ITEM_T enum) */
-    EDA_ITEM*    m_Comp;                    /* Pointer to the library item that
+    EDA_ITEM*    m_Comp;                    /* Pointer to the item that
                                              * created this net object (the parent)
                                              */
     SCH_ITEM* m_Link;                       /* For SCH_SHEET_PIN:

eeschema/sch_component.cpp

@@ -1668,7 +1668,7 @@ void SCH_COMPONENT::GetNetListItem( NETLIST_OBJECT_LIST& aNetListItems,
                 // There is an associated PIN_LABEL.
                 item = new NETLIST_OBJECT();
                 item->m_SheetPathInclude = *aSheetPath;
-                item->m_Comp = m_pins[ m_pinMap.at( pin ) ].get();;
+                item->m_Comp = m_pins[ m_pinMap.at( pin ) ].get();
                 item->m_SheetPath = *aSheetPath;
                 item->m_Type = NETLIST_ITEM::PINLABEL;
                 item->m_Label = pin->GetName();

eeschema/sch_edit_frame.cpp

@@ -1189,3 +1189,10 @@ bool SCH_EDIT_FRAME::IsContentModified()
 
     return sheetList.IsModified();
 }
+
+
+bool SCH_EDIT_FRAME::GetShowAllPins() const
+{
+    EESCHEMA_SETTINGS* cfg = eeconfig();
+    return cfg->m_Appearance.show_hidden_pins;
+}

eeschema/sch_edit_frame.h

@@ -183,6 +183,11 @@ public:
 
     void OnCloseWindow( wxCloseEvent& Event );
 
+    /**
+     * Allow edit frame to show/hide hidden pins.
+     */
+    bool GetShowAllPins() const override;
+
     const wxString& GetNetListFormatName() const { return m_netListFormat; }
     void SetNetListFormatName( const wxString& aFormat ) { m_netListFormat = aFormat; }